Firefox 5.0 stalls while watching videos (at least) and the only way to get it back working is to close it and restart it, and this is not right !

I have been using Firefox 5.0 for the past few days. I have been experiencing the following error : I watch videos and suddenly, the video stops. From that point, it becomes impossible to open new tabs, especially, I tried to use the search box (with Google or Yahoo) on the top right of the page and got no result.
However, if I close the browser and restart it, Firefox works again, until it drops again. I therefore have to close it and open it again every 5 minutes to read a video (the problem also appears when not using the video). The only thing that might cause this that is not Firefox could be my latest upgrade from Xmarks, however I disabled the thing and still got the issue.
I would like to uninstall Firefox 5.0 from now and put Firefox 4 at least until the browser is more stable, but how do I do that ?

Hey ppgg,
Thanks for the question. I understand you are experiencing issues with Wi-Fi connectivity on your MacBook. The following resources may provide a solution.
First, go ahead and utilize Wireless Diagnostics to analyze the issue:
About Wireless Diagnostics
http://support.apple.com/kb/HT5606
Next, see the section titled “Symptom: The network connection drops unexpectedly” in the following article:
Wi-Fi: How to troubleshoot Wi-Fi connectivity
http://support.apple.com/kb/HT4628
Thanks,
Matt M.

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